TX2 and tegrastats output

I’m encoding an h265 stream using omxh265enc but tegrastats show 0% usage on CPU …why?

RAM 550/7850MB (lfb 1576x4MB) cpu [0%@1211,off,off,0%@1209,0%@1217,0%@1211] EMC 27%@665 APE 150 MSENC 550 GR3D 0%@114
RAM 550/7850MB (lfb 1576x4MB) cpu [3%@1263,off,off,5%@1244,3%@1256,77%@1243] EMC 27%@665 APE 150 MSENC 550 GR3D 0%@114
RAM 550/7850MB (lfb 1576x4MB) cpu [7%@1266,off,off,22%@1267,2%@1267,59%@1266] EMC 27%@665 APE 150 MSENC 550 GR3D 0%@114
RAM 550/7850MB (lfb 1576x4MB) cpu [9%@1266,off,off,20%@1267,41%@1267,19%@1267] EMC 27%@665 APE 150 MSENC 550 GR3D 0%@114
RAM 550/7850MB (lfb 1576x4MB) cpu [4%@1267,off,off,23%@1267,1%@1266,61%@1267] EMC 27%@665 APE 150 MSENC 550 GR3D 0%@114

Hi xmerlin,
The first print may not be correct but the followings are good.
Please also refer to the post below:
https://devtalk.nvidia.com/default/topic/1024771/jetson-tx2/tx2-with-jetpack-3-1-gpu-utilization-issue-for-video-encoding-msenc-nvenc/post/5212820/#5212820